Notes: Small-medium mollymork, slender w. pearl-grey
hood, white cap. Nominate bulleri (southern Buller's) bill has broad
yellow upper margin separated by grey from narrow yellow lower edge; broad
black leading edge, narrow trailing edge, to wings. Ssp platei (northern
Buller's) has darker head & broader yellow culmen; difficult to separate.
Breeds NZ Isls., and many then migrate to seas off Peru & Chile. Common
off E Tas Jan–Aug, abundant in winter.